Seat belt sizing accessory



FIG. 1 is a perspective view of a seat belt sizing accessory showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is an end elevational view thereof; and,

FIG. 5 is an end elevational view thereof. 

The ornamental design for a seat belt sizing accessory, as shown and described. 